Space Vector Pulse Width Modulation (SVPWM) method is an advanced, computation intensive PWM method and possibly the best among all the PWM techniques for variable frequency drive applications. The SVPWM is an alternative method for the determination of switching pulse width and their position. The major advantage of SVPWM stem from the fact that, there is a degree of freedom of space vector placement in a switching cycle. This feature improves the harmonic performance of this method. This... Topics: SVPWM, 7-Segment SVM, 5-Segment SVM, Two -Level Inverter, SIMULINK
This paper proposes a genetic algorithm optimization technique for optimal placement of distributed generation in a radial distribution system to minimize the total power loss and to improve the voltage sag performance. Load flow algorithm and three phase short circuit analysis are combined appropriately with GA, till access to acceptableresults of this operation. The suggested method is programmed under MATLAB software. The implementation of the algorithm is illustrated on a 34-node radial... Topics: Distributed Generation, Line Loss, Voltage Sag, Genetic Algorithm, and Radial Distribution network
This paper presents an alternative approach for the design of linear phase digital low pass FIR filter using Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach (PSO-CFIWA). FIR filter design is a multimodal optimization problem. The conventional gradient based optimization techniques are not efficient for digital filter design. Given the filter specification to be realized, PSO algorithm generates a set of filter coefficients and tries to meet the ideal frequency... Topics: FIR Filter, PSO, GA, Optimization, Magnitude Response, Convergence, Low Pass Filter
Variable Frequency Transformer (VFT) is a controllable bi-directional transmission device that can transfer power between asynchronous networks. It avoids both HVDC link and FACTS based power transmission control system. Basically, it is a rotatory transformer whose torque is adjusted in order to control the power flow. In this paper, a simulated model of VFT is used as a controllable bidirectionalpower transmission device that can control power flow through the connected asynchronous power... Topics: Variable frequency transformer (VFT), MATLAB, Asynchronous power systems, Power flow.
This paper presents the speed control of a separately excited DC motor using Fuzzy Logic Control (FLC). The Fuzzy Logic Controller designed in this study applies the required control voltage based on motor speed error (e) and its change (ce). The performance of the driver system was evaluated through digital simulations using Simulink. The simulation results show that the control with FLC outperforms PI control in terms of overshoot, steady state error and rise time. Topics: DC motor, chopper, FLC.
byDurbadal Mandal, Debanjali Sadhu and Sakti Prasad Ghoshal
Circular antenna array has gained immense popularity in the field of communications nowadays. It has proved to be a better alternative over other types of antenna array configuration due to its all-azimuth scan capability, and a beam pattern which can be kept invariant. This paper is basically concerned with the thinning of a large multiple concentric circular ring arrays of uniformly excited isotropic antennas based on Improved Particle Swarm Optimization (IPSO) method. In this paper a 9... Topics: Concentric Circular Antenna Arrays, Particle Swarm Optimization, Thinning, Sidelobe Level
Humans are able to process a face in a variety of ways to categorize it by its identity, along with a number of other demographic characteristics, including race, gender , and age. Experimental results are based on a face database containing subjects. Race and gender also play an important role in face-related applications. Experimental results are indicated that participants categorized the race of the faceand this categorization drives the perceptual process. A face image data set is... Topics: race identification, PCA, face recognition
This paper presents a Marathi database and isolated Word recognition system based on Mel-frequency cepstral coefficient (MFCC), and Distance Time Warping (DTW) as features. For the extraction of the feature, Marathi speech database has been designed by using the Computerized Speech Lab. The database consists of the Marathi vowels, isolated words starting with each vowels and simple Marathi sentences. Each word has been repeated three times by the 35 speakers. This paper presents the comparative... Topics: CSL, MFCC, DTW, Spectrogram, Speech Recognition and statistical method
This paper presents a new soft-switched resonant dcdc converter using a passive snubber circuit. The proposed converter uses a new zero voltage and zero current switching (ZVZCS) strategies to get ZVZCS function. Besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage and current stresses. In order to validate the proposed converter, computer simulations and experimental results were conducted. The paper indicates the effective... Topics: ZVZCS, resonant, converter, semiconductor, current switching, snubber
This paper presents a study of harmonic filters design procedure to minimize harmonic distortion caused by a harmonic source such as drives. The non – linear load considered in this paper is six pulse rectifier load. Design and simulation procedure with respect to this load is explained in details. Several types of shunt harmonic filters are presented. Shunt filters are effective in minimizing voltage distortion caused by nonlinear loads in industrial power systems. Different alternatives of... Topics: Harmonics, passive shunt filters, single tuned filter, high pass filter, filter rating
Spectrum analysis is very essential requirement in instrumentation and communication signal interception .Spectrum analysis is normally carried out by online or offline FFT processing. But the FFT being highly mathematical intensive, is not suitable for low area and low power applications. Offline FFT processing can’t give the real time spectrum estimation which is essential in communication signal interception. Online FFT computation takes very high resources, which makes the system costly... Topics: FFT, Goertzel algorithm, Spectrum Analysis, VHDL, XilinX ISE, Modelsim, Spartan 3E-FPGA board.
Static Synchronous Series Compensator (SSSC) has been designed with Superconducting Magnetic Energy Storage (SMES) system. A closed loop control scheme has been proposed with PI controller and real and reactive powers are taken as references. A 48 pulse voltage source inverter is designed for the SSSC. Control scheme for the chopper circuit of SMES coil is also designed. A three area system is taken as the test system and the operation of SSSC with SMES is analysed for various transient... Topics: SSSC, SMES, Transient stability, voltage source inverter, closed loop control
In this paper with the help of Matlab/Simulink and dSPACE, the Switch-Mode DC Converter is built in real-time to control the output voltage of the controller using PWM algorithm. First, the Simulink model of Switch-Mode DC Converter (i.e. Single-Pole and Two-Pole Converter Model) is built and, after verifying the results, it is implemented in real-time. Next, a DC motor is connected to the output terminals (i.e. Phase A1 and Phase B1) of the Power Electronics Board such that a variable voltage... Topics: Single-pole, Two-pole, dSPACE
Variable frequency transformer (VFT) is used as a controllable bidirectional transmission device that can transfer power between asynchronous networks and functionally is similar to back-to-back HVDC. This paper describes the basic concept of a New Model Variable Frequency Transformer (NMVFT). NMVFT is a new technology which is used for v/f control of induction motors. A digital simulation model of NMVFT and its control system are developed using MATLAB. The out power thus generated in v/f... Topics: Variable frequency transformer (VFT), Asynchronous, New Model Variable Frequency Transformer...
Scaling of metal-oxide-semiconductor transistors to smaller dimensions has been a key driving force in the IC industry. This work analysis the gate leakage current behavior of nano scale MOSFET based on TCAD simulation. The Sentaurus Simulator simulates the high-k gate stack structure of N-MOSFET for analysis purpose. The impact of interfacial oxide thickness on the gate tunneling current has been investigated as a function of gate voltages for a given equivalent oxide thickness (EOT) of 1.0... Topics: MOESFET, inelastic trap assisted tunnelling, gate tunneling current, High-k stack
This article presents a 3rd current-mode quadrature oscillator using current controlled current conveyor transconductance amplifier (CCCCTA) and operational transconductance amplifier (OTA) as active element as active elements. The proposed circuit is realized from a noninverting lossless integrator and an inverting second orderlow-pass filter. The oscillation condition and oscillation frequency can be electronically/orthogonally controlled via input bias currents. The circuit description is... Topics: oscillator, current-mode, CCCCTA, OTA
Harmonic Elimination in a multilevel inverters is an optimization problem which is solved by applying particle swarm optimization (PSO) technique. The derived equation for the computation of total harmonic distortion (THD) of the output voltage of the multilevel inverter is used as the objective function in PSO algorithm. The objective function used is to reduce the THD of the multilevel inverter and obtain the corresponding switching angles with the elimination of possible lower order... Topics: selective harmonic elimination(SHE), particle swarm optimization(PSO), Total harmonic...
Data mining helps to find predictive information from large databases. Companies use predictive modeling tools for strategic decision-making. It helps companies to identify and account for the key assumptions that drive business value—enabling good decision making that leads to predictable results. By analyzing the company’s historical information we can anticipate these changes. This paper aims at providing a proposed data mining solution that can be used for automotive market, especially... Topics: Data Mining, Predictive Modeling, Linear regression Analysis, WEKA
Due to increasing industrialization quantity of waste water is increasing at alarming rate while compositions of such waste are being more and more complex. Disposal of such waste must follow suitable treatments so that qualities of effluent for disposal follow requisite standards. Such Standards for effluent are discussed and a case study for a beverage producing plant is reported. Topics: industrial waste, eco-friendly disposal, effluent standards, law enforcement, waste minimization.
In this paper, two different Wavelet based Image Compression techniques are compared. The techniques involved in the comparison process are WDR and ASWDR. The above two techniques are implemented with different types of wavelet codecs. Wavelet difference reduction (WDR) has recently been proposed as a method for efficient embedded image coding. This method retains all of the important features like low complexity, region of interest, embeddedness, and progressive SNR. ASWDR adapts the scanning... Topics: Wavelet Image Compression, WDR, ASWDR
byProf. Hapse Manik M., Dr. A.G. Thosar, Prof. Sanjay M. Shinde and Prof. Satish A. Markad
This paper analyzes the probability distribution of wind speed data recorded by Maharashtra Energy Development Agency (MEDA) wind farm at Ahmednagar (India). The main objective is to validate the wind energy probability by using probability distribution function (PDF) of available wind potential. The wind speed is measured with the help of three anemometers S30, S45, S60 placed at 30 m, 45 m, and 60 m height. Mean values are recorded and stored for every hour using a Data logger. For accounting... Topics: probability distribution function, weibull distribution, maximum likelihood, lognormal...
A novel example-based process for automated colorization of grayscale images using texture descriptors (ACTD) without any human intervention is proposed. By analyzing a set of sample color images, coherent regions of homogeneous textures are extracted. A multi-channel filtering technique is used for texture-based image segmentation. For each area of interest, state of the art texture descriptors are then computed and stored, along with corresponding color information. These texture descriptors... Topics: Image colorization, Fuzzy C-means clustering, Gabor transform, CBIR
This paper gives an overview and analyzes the different existing anti spamming techniques both content based, non content based methods and a combination of the duo. It also suggests that a small change in one of the parameters in the fuzzy string matching method could be useful to produce better results. Topics: email, spam, computer forensics, fuzzy string match
Physical layout automation is very important in VLSI’s field. With the advancement of semiconductor technology, VLSI is coming to VDSM (Very Deep Sub Micrometer), and the scale of the random logic IC circuits goes towards million gates. Physical design is the process of determining the physical location of active devices and interconnecting them inside the boundary of the VLSI chip.The earliest and the most critical stage in VLSI layout design is the placement. The background is the rectangle... Topics: Placement problems, Memetic algorithm, wire length minimization, area minimization.
A refined space vector modulation scheme for multilevel inverters, using only the instantaneous sampled reference signals is presented in this paper. The proposed space vector pulse width modulation technique does not require the sector information and look-up tables to select the appropriate switching vectors. The inverter leg switching times are directly obtained from the instantaneous sampled reference signal amplitudes and centers the switching times for the middle space vectors in a... Topics: dual-fed induction motor, space vector PWM, sampled sinusoidal reference signals, triangular...
In this paper, a built-in self repair technique for word-oriented two-port SRAM memories is presented. The technique is implemented by additional hardware design instead of traditional software diagnostic procedures and the computation time is minimized. A built-in self-test (BIST) is used to detect the faulty locations which are isolated immediately after detection. Therefore, the redirection process can be executed as soon as possible. Spare rows are used to replace the faulty rows. The... Topics: SRAM, two-port memories, PVT faults, fault isolation, BISR
With the explosive growth of international users, distributed information and the number of linguistic resources, accessible throughout the World Wide Web, information retrieval has become crucial for users to find, retrieve and understand relevant information, in any language and form. Cross- Language Information Retrieval (CLIR) is a subfield of Information Retrieval which provides a query in one language and searches document collections in one or many languages but it also has a specific... Topics: Cross Lingual Information Retrieval, Heuristic Method, Text Categorization
A distribution system is an interface between the bulk power system and the consumers. The radial distribution system is popular among these because of its low cost and simple design. The voltage instability in the power system is characterized by a monotonic voltage drop, which is slow at first and becomes abrupt after some time when the system is unable to meet the increasing power demand. Therefore to overcome these problems capacitors are used. The installation of the shunt capacitors on... Topics: Electrical Distribution Network, Optimal Capacitors Placement, Dimension reducing distribution load...
These paper presents the dynamic operation of a novel control scheme for Static Synchronous Compensator (STATCOM) based on a new full model comprising a 48-pulse Gate Turn-Off (GTO) thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The novel controllerfor the STATCOM presented in this paper is based on a decoupled strategy using the direct and quadrature components of the STATCOM current. The complete digital... Topics: 48-pulse GTO thyristor model STATCOM, novel decoupled control strategy, reactive compensation,...
byK.Vivekanandan1 , S.Neelavathi, S.Subhashree, G.Kavitha, and S.Kavitha
The concept of dynamic composition of Web services has been given major importance in the recent years. While there are many systems available to select the services with the highest QoS score, very little thought has been given to the fact of constructing a model which takes in the user’s rating of a service as a major input for selection. A robust system for fetching the most updated version of the selected services and selection of the services based on users’ ratings of the QoS values... Topics: Web Service selection, rating, updated services, aging factor
This paper presents an approach for reducing speckle in ultrasound images using Coupled Partial Differential Equation (CPDE) which has been obtained by uniting secondorder and the fourth-order partial differential equations. Using PDE to reduce the speckle is the noise-smoothing methods which is getting attention widely, because PDE can keep the edge well when it reduces the noise. We also introduced a median regulator to guide energy source to boost the features in the image and regularize... Topics: Ultrasound, Speckle, PDE, median filter.
The new technique we proposed in this paper based on Hidden Markov Model in the field of post compression rate distortion algorithms certainly meet the requirements of high quality still images. The existing technology has been extensively applied in modern image processing. Development of image compression algorithms is becoming increasingly important for obtaining a more informative image from several source images captured by different modes of imaging systems or multiple sensors. The JPEG... Topics: JPEG 2000, Hidden Markov Model, Rate distortion, Scalability, Image compression, post compression
There is often a requirement to fabricate thin glass plates for prototyping purposes in a research lab. For example to make a prototype of an optic filter there is a need to fabricate a number of thin glass plates and in most moderately equipped optic research laboratory there is facility to etch these glass plates, but lacks instruments to measure its thickness. Our main purpose is to design a system which is cost friendly and is capable of measuring the thickness with a resolution lesser than... Topics: Thickness, Measurement, Electronic System, Optic Device, Michelson Interferometer
Power system performance is affected by dynamic characteristics of hydraulic governor-turbines during and following any disturbance, such as occurrence of a fault, loss of a transmission line or a rapid change of load. Accurate modelling of hydraulic System is essential to characterize and diagnose the system response. In this article the mathematical modeling of hydraulic turbine is presented. The model is capable to implement the digital systems for monitoring and control replacing the... Topics: mathematical modeling, simulation, hydraulic turbine
Credibility of a web-based document is an important concern, when a large number of documents is available on internet for a given subject. In this paper, various criteria that affect the credibility of a document are explored. An attempt is made to automate the process of assigning a credibility score to a web-based document. Presently the prototype of the tool developed is restricted to only four criteria – type of website, date of update, sentiment analysis and a pre-defined Google page... Topics: credibility score, source evaluation, automation, web-based multiple documents
A key element to the success of any organization is the ability to continuously improve its business process performance. Efficient Business Process Redesign (BPR) methodologies are needed to allow organizations to face the changing business conditions. For a long time, practices for BPR were done case-by-case and were based on the insights and knowledge of an expert to the organization. It can be argued that efficiency, however, can further be achieved with the support of automatic process... Topics: Process Mining, Business Process Redesign, Business Process Management
DBNorma  is a semi automated database normalization tool, which uses a singly linked list to store a relation and functional dependencies hold on it. This paper describes possible algorithms that can be used to normalize a given relation represented using singly linked list. Thesealgorithms are tested on various relational schemas collected from several research papers/resources and output validated. We have also determined the time required to normalize a given relation in 2NF and 3NF and... Topics: Relation, functional dependency, normalization, normal forms.
This paper solves reliability constrained unit commitment problem (UCP) for a composite power system network using network equivalent technique. Here, the integration of generation and transmission system reliability forms a composite power system model. The inclusion of load forecast uncertainty for the solution of unit commitment problem will give more accurate assessment of spinning reserve (SR). Probabilistic techniques help in setting the reserve requirement which is defined by reliability... Topics: Composite generation and transmission system, Genetic algorithm, Load forecast uncertainty, Network...
Stone Matrix Asphalt (SMA) is a gap graded mix, characterized by high coarse aggregates, high asphalt contents and polymer or fiber additives as stabilizers. In comparison to dense graded mixtures SMA has higher proportion of coarse aggregate, lower proportion of middle size aggregate and higher proportion of mineral filler. It resists permanent deformation and has the potential for long term performance and durability. In the present study, an attempt has been made to study the resilient... Topics: stone matrix asphalt, coconut fibre, repeated load indirect tensile test
In this paper a novel method for image enhancement using PDTDFB (Pyramidal Dual-Tree Directional Filter Bank) and interpolation has been adopted. Generally, in digital images since the different kinds of noise highly affects various image processing techniques it is always better to perform denoising first. Here, first of all the image is decomposed into two different layers namely low pass sub band and high pass sub band after which denoising is being performed on both the layers so as to... Topics: High Resolution, PDTDFB, Denoising, Interpolation, Image Composition.
The conventional line commutated ac-to-dc converters/ inverters have square-shaped line current which contains higher-order harmonics. Moreover, it requires a costly and bulky dc inductor or choke. The line current with the high harmonic contents generates EMI and therefore itcauses more heating of the core of distribution or power transformers. Alternatively, PWM based inverters using MOSFET/IGBT switches can be used for the above purpose. However, apart from higher switching losses, the power... Topics: grid connected inverter, total harmonic distortion (THD), simulink, line current
This paper investigates the problem of dynamic multiuser subchannel allocation in the downlink OFDM systems. In traditional TDMA or FDMA systems, resource allocation for each user is non-adaptively fixed. Since the subchannel allocations among the users are not optimized, a group of users is likely to suffer from poor channel gains resulting from large path loss and random fading. To resolve this problem a low-complexity adaptive subchannel allocation algorithm is proposed in this paper. By... Topics: OFDM, Sub-Channel, Multiuser, Variable Data Rate.
Software metrics is applied evaluating and assuring software code quality, it requires a model to convert internal quality attributes to code reliability. High degree of complexity in a component (function, subroutine, object, class etc.) is bad in comparison to a low degree of complexity in a component. Various internal codes attribute which can be used to indirectly assess code quality. In this paper, we analyze the software complexity measures for regression testing which enables the... Topics: Software Complexity, Software Metrics, Regression Testing, Control Flow Metrics1
Distributed databases have become the most essential technology for recent business organizations. In most of the cases Distributed Databases are developed in a Bottom- Up approach, fragmentation exists beforehand. The optimum allocation of those fragments is the only way, which can be exploited by the designers to increase the performance, efficiency, reliability and availability of the DistributedDatabase in the realistic dynamic environment, where the access probabilities of nodes to... Topics: Distributed Database, Fragmentation, Dynamic Fragment Allocation, Distributed Transaction, Local...
We present in this paper a very fine method for determining the location of a ground based target when viewed from an Unmanned Aerial Vehicle (UAV). By determining the pixel coordinates on the video frame and by using a range finder the target’s geo-location is determined in the North- East-Down (NED) frame. The contribution of this method is that the target can be localized to within 9m when view from an altitude of 2500m and down to 1m from an altitude of 100m.This method offers a highly... Topic: UAV Applications
In this paper we introduce a method for part-ofspeech disambiguation of Persian texts, which uses word class probabilities in a relatively small training corpus in order to automatically tag unrestricted Persian texts. The experiment has been carried out in two levels as unigram and bi-gram genotypes disambiguation. Comparing the results gained from the two levels, we show that using immediate right context to which a given word belongs can increase the accuracy rate of the system to a high... Topics: genotype, machine translation, part of speech disambiguation, word class probabilities
Modern embedded systems are built around the soft core processors implemented on FPGA. The FPGAs being capable of implementing custom hardware blocks giving the advantage of ASICs, and allowing the implementation of processor platform are resulting in powerful Configurablesystem on chip(C-SoC)platforms. The Microchip’s PIC microcontroller is very widely used microcontroller architecture across various embedded systems. The implementation of such core on FPGA is very much useful in CSOC based... Topics: CPU, RISC, IP Core, IC, MXE, Xilix.
In this paper, we attempt to present a comparison through rigorous studies (existing conventional models) following software based modeling and verifications through simulations in terms of various traffic parameters such as packet loss, Recovery Time (Latency), reordering of packets including recovery time for various widely used path recovery models for the purpose of end-to-end recovery of LSPs inMPLS domains using NS2 simulator. Topics: MPLS .path -recovery, software modeling and simulations, traffic engineering, LSP (Label Switch...
Seamless interoperability between two dissimilar networks requires handoff from one network to the other. Such handoffs are known as vertical handoffs. Vertical handoff introduces a shift in the approach to handoffs. It deals with handoffs between dissimilar networks, such as from an access point to a base station or vice versa. The integration of diverse but complementary cellular and wireless technologies in the next generation of wireless communication systems requires the design of... Topics: Vertical Handover, Base Stations, Signal Strength, Unused Bandwidth, Handover Decision Vector
This paper proposes a compact electric discharge plasma source for controlling NOX emission in diesel engine exhaust. Boost converter is used to boost to solar powered battery voltage to 24V, further an automobile ignition coil was used to generate the high voltage pulse using fly-back topology. This design is aimed at retrofitting the existing catalytic converters with pulse assisted cleaning technique. In this paper we bring out a relative comparison of discharge plasma and plasma-adsorbent... Topics: Electric Discharge, Non-thermal plasma, NOX removal, Diesel engine exhaust, Fly-back